How To Measure A Bike Frame

How To Measure A Bike Frame

In this video, Tom Newman from Capital Cycle Coaching will show you how to measure a bike frame. You'll learn the three main dimensions that need to be measured and the reason for measuring them.

To measure a bicycle frame, dimension is taken from the centreline of the bottom bracket which is an axle running through the frame, to the top of the frame, which is that position there. On this one here, it's 20 inches, which is an imperial measurement which is roughly about 510 millimeters. The next dimension to take is from the tip of the saddle to the centreline of the bars, gives you an idea.

This one here is about 22 and ¾; metric, about 580 millimeters. The other important dimension, of course, is the height of the handle bars. So, you take that from the centre line of the spindle to the top of the bars.

And my one here measures roughly about 26 inches which is about 650 millimeters. And if I was to get on another bike, I would try and replicate those positions. Of course, the saddle can go backwards and forwards.

You can change this stem, this is quite a long stem, as you can see. If you want a shorter riding position for example, if you're quite a small guy, this here measures 5 and 1/2 inches which is 140 millimeters. You can decrease that to maybe four inches, 100 millimeters.

So therefore, that distance from there to there is brought in closer. So to recap those measurements, you need to measure from the centreline of the bottom bracket to the top of the frame, you measure from the peak of the saddle to the centreline of the handlebars, and you measure from the centreline of the wheel to the centreline of the handlebars. Those are the three main dimensions which you try and repeat on all your bikes or close as so you get the same riding position whatever bike you jump on at home. .